shaping light2011 led architexture-picusled-2

Architecture of LED systems

Fotonica-2011Rob AlferinkMarch 30.

Shaping Light 2011, PicusLED

Outdoor

Mobile Phone

Automotive

IndoorDisplay

LED system, typical architecture


control

driver


Interactions

MCPCB

FR4

Breakdown

Performance-Reliability-flexibility-COSTS


Breakdown on deeper level

Shaping Light 2011 ,PicusLED

System engineering on a high level with options to optimize the LED

Outdoor Lighting fixture


Tube

LED

Plastic cover

Heat sink Proper lensLEDs for 900 lm

RGB mixing, another issue

Shaping light 2011, PicusLED

3 color differ in dom wavelength3 colors in xy color space

BBL

Make 3000K

Drift by increase of ambient T

25C

50CAnsi bins

Requiers color measurement and control

Linear LED source, looks simple


T junction

T solder

T heatsink

T ambient

Rth -LED

Rth -board

Rth –heat sink

25 C

50 C

SO:For 50 cm12 x 1 W48 x ¼ W

Linear source , uniformity

Shaping Light 2011,PicusLED

Standard coverDiscrete sources

Diffuser materialLine source

So For 50 cm

12 x 1 W 12 x3=36V

48 x ¼ W 144 V

3 parallel strings of ~ 48 V

Binning issue ?!

Binning

Shaping light 2011, PicusLED

Flux [lm]-Forward voltage [V]- color CCT or dom. wavelength [x,y]

0.24 V * 16 = 4V

Architecture of LED systemsAny questions?


shaping light2011 led architexture-picusled-2

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